Function Signature

js

labToRgb(L: number, a: number, b: number): { r: number, g: number, b: number }

Parameters

L (number): Lightness component (0–100).
a (number): Green–red axis (typically ~ -128 to +127).
b (number): Blue–yellow axis (typically ~ -128 to +127).

Return Value

An object with RGB components (r, g, b) as integers in the range 0–255.

js

labToRgb(62, 58, 70);
// { r: 255, g: 102, b: 0 }

labToRgb(66, -7, -41);
// { r: 0, g: 170, b: 255 }

labToRgb(100, 0, 0);
// { r: 255, g: 255, b: 255 }

labToRgb(0, 0, 0);
// { r: 0, g: 0, b: 0 }

Conversion Details

Uses D65 reference white (Xn = 95.047, Yn = 100.0, Zn = 108.883).
Intermediate step converts Lab → XYZ, then XYZ → linear RGB.
Applies gamma correction (linearToSrgb) to produce final sRGB values.
RGB values are clamped to the range 0–255.

Examples

js

// Bright red
console.log(labToRgb(53, 80, 67));
// { r: 255, g: 0, b: 0 }

// Forest green
console.log(labToRgb(50, -47, 45));
// { r: 34, g: 139, b: 34 }

Usage Notes

The function ensures perceptually accurate Lab → RGB conversion.
Useful for reversing rgbToLab transformations when working with perceptual color differences.
Values outside of the displayable RGB gamut are clamped automatically.